Planting more trees gives us oxygen to breathe.  Which of the following does it also improve?

Dissolved oxygen in ocean water because of decomposed algae can result to_______________.

Clean-up drive is good to the environment because it can lessen _____.

What problems are associated with overpopulation?

Which of the following human activities may disrupt ecological balance?

Which of the following environmental problems is the result of human activity?

Which human activity would be most likely to have a negative impact on the environment?

Protecting the environment can be done through conservation and preservation. Which of the following is NOT a concept of environmental protection?

Burning of fossil fuel affects the environment the most through ___________.

Which of the following is the best way to help in protecting the environment to achieve sustainable development?